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lengan beban (lb) = 0,3 m
lengan kuasa (lk) = 3 - 0,3 = 2,7
kuasa (k) = 120 N
a. berat batu (b)
b x lb = k x lk
b x 0,3 = 120 x 2,7
b x 0,3 = 324
0,3 0,3
b = 1080 N
b. keuntungan mekanis = = = 9
atau bisa juga dg cara = = = 9